1 Plus 1

Description

Something is going bump in the night!... and also thud and stomp and MORE bumping! Then Sung-eun literally bumps into the reason for all the noise: her handsome and charming neighbor, Eun-sung. The two of them share a similar name, the same major, and so many classes, but Sung-eun doesn't immediately realize they share the same housing. The two hit it off pretty quickly, but some things don't add up... What secrets will they discover about each other? Time to put one plus one together... (From Tapas)

Original Webtoon:
Lezhin, Bomtoon, KakaoPage, Ridibooks, Naver Series

Official Translations:
Japanese, French
English: Lezhin, Tapas, Lalatoon

*All English Platforms have the Lezhin Translation *

Type

Manhwa

Related Series

N/A

Associated Names

1 Deohagi 1-eun

1 더하기 1은

1たす1は

1加1是

1더하기1은

Mon Charmant voisin

Groups Scanlating

Lezhin

Latest Release(s)

c.1 by Lezhin 8 months ago

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Status in Country of Origin

52 Chapters (Complete)

S1: 29 Chapters (1~29)
S2: 23 Chapters (30~52)

Completely Scanlated?

Yes

Anime Start/End Chapter

N/A

User Reviews

N/A

Forum

0 topics, 0 posts

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User Rating

Average: 7.4 / 10.0 (73 votes)

Bayesian Average: 7.07 / 10.0

18%

14%

19%

22%

10%

Last Updated

August 8th, 2025 10:46pm PDT - 3 weeks ago

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Genre

Drama Romance School Life Shoujo
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Categories

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Category Recommendations

In Between

Be My Only Love

How to Train Your Healer

Love Me Better Than

Love on Campus

Recommendations

N/A

Author(s)

SORU

Artist(s)

SORU

Year

2019

Original Publisher

Bomtoon

Lezhin

Serialized In (magazine)

Lezhin (Lezhin)

KakaoPage (Kakao)

Bomtoon (Bomtoon)

Licensed (in English)

Yes

English Publisher

Copin Comics (Expired)

Lalatoon

Lezhin US (Original Publisher)

Tapas

Activity Stats (vs. other series)

Weekly Pos #791

(-4)

Monthly Pos #2017

(-44)

3 Month Pos #3047

(-461)

6 Month Pos #3718

(-1008)

Year Pos #5182

(-160)

List Stats

On 92 reading lists

On 156 wish lists

On 206 completed lists

On 14 unfinished lists

On 102 custom lists

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Forum Posts Click to view the forum

User Comments [ Order by usefulness ]

FL is annoying and naive that I can't stand

by TracyNg
1 year ago

Rating: 5.0 / 10.0

Enjoyable at first... The plot is not depth and make me feel uncomfortable, esp both ML and FL

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cut short

by Kichido
2 years ago

Rating: 5.0 / 10.0

It wasn't bad, read it in between waiting in the car so kinda scattered, the story wasn't bad but there just wasn't much to it, short, not a lot of depth, they added a love rival at the end (just to have something more interesting I suppose?) and then it just ended, it didn't say what waited them in the future, like marriage, job, kids..., some side/after stories would have helped a lot.

The most annoying thing about it was the names, I mean the FL is called Sung-Eun and the ML is Eun-Sung, like could you f**ng distinguish them a bit more dammit ? it might be where the 1 plus 1 name comes from, I think Koreans like that sort of sht for some reason, maybe they think it means they're fated, while I just think it's stupid and unimaginative, anyway, I don't really recommend it.

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Pretty art, nice execution except there's a little irking drama near the end

by LienHoa
2 years ago

Rating: 8.5 / 10.0

N/A

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Read if you're bored

by Missjennie
3 years ago

Rating: N/A

It's funny but the FL is a moron.

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Enjoyable... at first

by Tattletale
4 years ago

Rating: N/A

I did enjoy this at first but the FL started to really irritate me, she ends up acting so childishly about her feelings towards the ML

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Fun read, could've gone a little longer

by brandito
4 years ago

Rating: 8.0 / 10.0

This one has a good cast of really charming characters, especially the FL. I especially like how upfront she is about her feelings since that seems so rare in a genre where a character can spend 80 chapters denying something everybody else has already figured out. I even would've liked 20 more chapters of fluff and side character stuff. A surprisingly mature take on a pretty average type of relationship.

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Fun Fluff Read

by onionguy
4 years ago

Rating: N/A

It’s a sweet story! Felt like some loose ends weren’t totally tied up (ML’s family stuff), but the ending was otherwise very fitting.

I thought the last chapter had so many cute (and funny) panels, and I’m glad it ended on such a light-hearted note.

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Relatable characters with realistic flaws

by ChildofSecrets
5 years ago

Rating: N/A

I really enjoyed this webtoon, more than I thought I would! What made me love the series the most was the female lead. She was introverted and anxious but still full of personality, very strong, and also embarrassingly relatable. Both the female and male lead were also multidimensional in that they had character flaws but also thought deeply about who they were as people and their mistakes (at first I thought the male lead sucked, but he gets a lot less sucky). There is a lot of internal narrative and reflection balanced with light-hearted goofy humor and it honestly cracked me up to the point of tears a couple times. And to top it off, it has a good message about maintaining healthy relationships along with individuality and independence which is pretty rare to see expressed in romcoms. However, the ending was pretty rushed, which made for poor pacing as a whole, but not so much it made it unsatisfying or unenjoyable. I definitely recommend it if you like light-hearted rom-coms with introspective characters!

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secondhand embarrassment

by ciawoo
5 years ago

Rating: N/A

This webtoon is a fun read but there was a lot of secondhand embarrassment, I didn't know how I managed to finish reading this. Overall, some would probably find the characters relatable especially if you

experienced being in a friendzone or being with someone you see as more than friends

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A pretty fun read, but a bit rushed.

by kzh01
5 years ago

Rating: 8.5 / 10.0

I like the art style of this manga, reminds me of "oh holy", but for me the development between the characther is a bit rushed. The drama wasn't that overblown. But there are several redundant side character that was there but wasn't very influential to the story line, the author could at least make a light drama for it but maybe the time wasnt enough. overall a light read

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